CN104904268A - A method and a network node for improved resource utilization in a load balanced radio communication system - Google Patents
A method and a network node for improved resource utilization in a load balanced radio communication system Download PDFInfo
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- CN104904268A CN104904268A CN201380070176.8A CN201380070176A CN104904268A CN 104904268 A CN104904268 A CN 104904268A CN 201380070176 A CN201380070176 A CN 201380070176A CN 104904268 A CN104904268 A CN 104904268A
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- 238000004891 communication Methods 0.000 title description 16
- 238000005259 measurement Methods 0.000 claims description 69
- 238000004590 computer program Methods 0.000 claims description 25
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- 230000008054 signal transmission Effects 0.000 claims 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/086—Load balancing or load distribution among access entities
- H04W28/0861—Load balancing or load distribution among access entities between base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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Abstract
The present disclosure concerns movements, such as handovers, of user equipments (UEs) 120a-e from one radio cell 130a to another radio cell 130b. Disclosed herein are methods as well radio network nodes 110a, 110b. A radio network node 110a, 110b may, for example, select the most suitable UE(s) 20a-e to move from a source radio cell 130a to a target radio cell 130b in case the traffic load in the source radio cell 130a is below or equal to the traffic load of the target radio cell 130b. Hereby it is made possible to improve the resource utilization.
Description
Technical field
In general, presented herein embodiment relates to radio circuit.More particularly, presented herein embodiment relates to the movement of subscriber equipment between radio plot (such as, switching).
Background technology
Can see document to the detailed description of radio circuit and system, the technical specification such as issued by such as third generation partner program (3GPP).3GPP Long Term Evolution (LTE) is the forth generation radio communication technology standard of exploitation in third generation partner program (3GPP), it for improving Universal Mobile Telecommunications System (UMTS) standard so that the forward requirement of the service aspect of the improvement of such as higher data rate, the efficiency of raising and the cost of reduction of reply.Universal terrestrial radio electricity access network (UTRAN) is the radio access network of UMTS, and evolved UTRAN(E-UTRAN) be the radio access network of LTE system.In UTRAN and E-UTRAN, subscriber equipment (UE) is wirelessly connected to radio base station (RBS), and in umts, RBS is commonly referred to NodeB(NB), and in LTE, RBS is commonly referred to evolved NodeB(eNodeB or eNB).RBS can transmit to UE the general terms that radio signal also receives the radio network node of the signal transmitted by UE.
In a radio communications system, the business between UE and radio network node is neither evenly distributed in radio plot, and it is inconstant in time yet.That is, during the specific period, certain radio plot may add heavy duty because of business, and adjacent radio cells may have low or limited business load.Therefore, propose load balance, that is, balance the business load between community, using as the mode improving the overall performance of radio communications system for these uneven situations.Can see document to the detailed description of the load balance that such as 3GPP supports, such as technical specification
3GPP TS 36.300 V.11.4.0, see such as 22.4.1 chapters and sections.It is known to those skilled in the art that to there is different modes to balance the business load between community.Utilize load balance, the community with low business load such as can become larger, and absorbs some UE from overload neighbor cell.Although these UE may, relatively away from the new radio network node of UE of serving new community, can force those UE to move (such as, switching) to more underloaded radio plot from overload radio plot.Therefore, put it briefly, load balance is the means improving overall performance in the business load between balance radio plot.In this respect, should understand, load balance to be not only positioned in radio plot on same frequency and generally to perform when covering different geographic regions.Load balance performs when also can be positioned on different frequency and the radio plot of such as cover part overlap in such as radio plot.
But, although radio plot obtains balance in business load, there is the utilization of resources and be not optimized or be not at least gratifying scene.Such as, exist needing how many radio resources (such as, the position (PRB) of each Physical Resource Block) aspect radio to utilize to/from UE transmission/reception information bit be not best or be not at least gratifying scene.In addition, if the business load of a radio plot is constantly higher than the business load of neighbor cell, so load balance generally will have the effect that UE is movement in one direction.That is, UE generally moves in the direction from the radio plot to other radio plot (that is, having the radio plot of relatively low business load) with relatively high business load.
Summary of the invention
Consider to carry out various embodiments disclosed herein with other in view of above.
The utilization of resources being to provide the improvement in radio communications system of catalogue.Advantageously, the embodiment described in the disclosure also should to allow in adjacent radio cells load balance, such as the specific period load balance time improve the utilization of resources in radio communications system.
The various embodiments set forth in attached independent claim solve this catalogue.Dependent claims of enclosing represents extra advantageous embodiment.
According to an aspect, provide a kind of method that radio network node by serving radio plot, source performs.The method comprises: the business load parameter determining the business load about radio plot, source; The signal of the business load parameter of the business load comprised about target radio cell is received from the radio network node of serving target radio cell; The business load parameter of radio plot, source and the business load parameter of target radio cell are compared, to determine whether the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell; From each UE Received signal strength one or more subscriber equipment (UE), described signal comprises the measuring-signal parameter about radio plot, source and the measuring-signal parameter about target radio cell; One or more UE that will select are determined based on the measuring-signal parameter about radio plot, source of each UE and the measuring-signal parameter about target radio cell; When the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, select determined one or more UE to move to target radio cell from radio plot, source; And selected UE is moved (280) to target radio cell.
Before receiving described signal from each UE in described one or more UE, the method can comprise to described one or more UE transmission signal alternatively, and the measurement that described signal is included in UE is about the signal parameter of radio plot, source and the request of measuring about the signal parameter of target radio cell.
In certain embodiments, the method also comprises: when determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, starts timer; And the UE selected by only moving in response to timer arrives time predefined restriction.
In one embodiment, signal parameter is Reference Signal Received Power (RSRP) value.Therefore, the method can comprise: for each UE, the measurement RSRP value about radio plot, source and the measurement RSRP value about target radio cell is compared; And at which (which) UE have on the basis of the maximum difference between measurement RSRP value about target radio cell and the measurement RSRP value about radio plot, source, determine the UE that will select.Alternatively, the method can comprise: at which (which) UE have on the basis about the maximum measurement RSRP value of target radio cell, determine the UE that will select.
In another embodiment, signal parameter is Reference Signal Received Quality (RSRQ) value.Therefore, the method can comprise: for each UE, the measurement RSRQ value about radio plot, source and the measurement RSRQ value about target radio cell is compared; And at which (which) UE have on the basis of the maximum difference between the measurement RSRQ value about target radio cell of each UE and the measurement RSRQ value about radio plot, source, determine the UE that will select.Alternatively, the method can comprise: at which (which) UE have on the basis about the maximum measurement RSRQ value of target radio cell, determine the UE that will select.
Further, selected UE is moved to target radio cell can comprise and send the signal comprising handover request to serve target radio cell radio network node.The described signal comprising handover request can comprise the cause information element of the mobile reason of instruction UE in addition.In addition, the method can comprise the signal of radio network node receiving package containing Handover Request Acknowledge from serving target radio cell.
In addition, in certain embodiments, following steps can be performed continuously or in predetermined interval: the business load parameter determining the radio plot, source of the business load about radio plot, source; Receive the signal of the business load parameter of the target radio cell of the business load comprised about target radio cell; And the business load parameter of radio plot, source and the business load parameter of target radio cell are compared, to check whether the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell.
In addition, the method can comprise: when the business load parameter of radio plot, source equals the business load parameter of target radio cell, determine that radio plot, source and target radio cell are load balances.
According to another aspect, provide a kind of radio network node for serving radio plot, source.This radio network node comprises: receiver, be configured to the signal receiving the business load parameter of the business load comprised about target radio cell from the radio network node of serving target radio cell, wherein receiver is also configured to from each UE Received signal strength one or more UE, and described signal comprises the measuring-signal parameter about radio plot, source and the measuring-signal parameter about target radio cell, processor, and for storing the memory of computer program code, radio network node is made to determine the business load parameter of the business load about radio plot, source when computer program code runs within a processor, the business load parameter of radio plot, source and the business load parameter of target radio cell are compared to determine whether the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, one or more UE that will select are determined based on the measuring-signal parameter about radio plot, source of each UE and the measuring-signal parameter about target radio cell, when the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, determined one or more UE is selected to move to target radio cell from radio plot, source, and selected UE is moved to target radio cell.
This radio network node also can comprise conveyer, and it is configured to described one or more UE transmission signal, and the measurement that described signal is included in UE is about the signal parameter of radio plot, source and the request of measuring about the signal parameter of target radio cell.
Further, this radio network node also can comprise timer.Memory and computer program code can be configured to make radio network node start timer when determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell by processor, and the UE selected by only moving in response to timer arrives time predefined restriction.
In one embodiment, signal parameter is Reference Signal Received Power (RSRP) value.Memory and computer program code can be configured to make radio network node by processor: for each UE, the measurement RSRP value about radio plot, source and the measurement RSRP value about target radio cell are compared; And at which (which) UE have on the basis of the maximum difference between measurement RSRP value about target radio cell and the measurement RSRP value about radio plot, source, determine the UE that will select.Alternatively, memory and computer program code can be configured to make radio network node by processor: at which (which) UE have on the basis about the maximum measurement RSRP value of target radio cell, determine the UE that will select.
In an alternative embodiment, signal parameter is Reference Signal Received Quality (RSRQ) value.Memory and computer program code can be configured to make radio network node by processor: for each UE, the measurement RSRQ value about radio plot, source and the measurement RSRQ value about target radio cell are compared; And at which (which) UE each UE had on the basis of the maximum difference between measurement RSRQ value about target radio cell and the measurement RSRQ value about radio plot, source, determine the UE that will select.Alternatively, memory and computer program code are configured to make radio network node by processor: at which (which) UE have on the basis about the maximum measurement RSRQ value of target radio cell, determine the UE that will select.
In certain embodiments, conveyer can be configured to send the signal comprising handover request to serve target radio cell radio network node.Such as, conveyer can be configured to transmit the described signal comprising handover request, and wherein this signal comprises the cause information element of the mobile reason of instruction UE in addition.Further, receiver can be configured to the signal of radio network node receiving package containing Handover Request Acknowledge from serving target radio cell.
In certain embodiments, receiver can be configured to continuously or comprise the signal of the business load parameter of the target radio cell of the business load about target radio cell in predetermined interval reception.Further, memory and computer program code can be configured to make radio network node continuously or in predetermined interval by processor: the business load parameter determining the radio plot, source of the business load about radio plot, source; And the business load parameter of radio plot, source and the business load parameter of target radio cell are compared, to determine whether the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell.
In addition, memory and computer program code can be configured to make radio network node by processor: when the business load parameter of radio plot, source equals the business load parameter of target radio cell, determine that radio plot, source and target radio cell are load balances.
Finally, radio network node can be evolved NodeB(eNB).
Accompanying drawing explanation
After reading the following description to various embodiment with reference to accompanying drawing, these and other aspects, features and advantages is by obviously and illustrated, in figure:
Fig. 1 illustrates the signal diagram of Example radio access networks;
Fig. 2 is the flow chart of the method illustrated according to an embodiment;
Fig. 3 a is the flow chart of the method step illustrated according to various embodiment;
Fig. 3 b illustrates form according to two signals of some embodiments or formation;
Fig. 4 is the flow chart of the method illustrated according to another embodiment;
Fig. 5 is the flow chart of the method illustrated according to another embodiment;
Fig. 6 illustrates the example embodiment of radio network node; And
Fig. 7 illustrates the signal diagram of Example radio access networks.
Embodiment
Now, more fully the present invention is described hereinafter with reference to accompanying drawing, some embodiment shown in accompanying drawing.But the present invention can implement by many different forms, and should not be construed as and be confined to set forth embodiment herein; But, these embodiments are exemplarily provided, to make the disclosure by thorough and complete, and scope of the present invention will be passed on to those skilled in the art comprehensively.During entire chapter describes, similar referential data representation class is like key element or method step.
Fig. 1 illustrates the exemplary scene in 3GPP LTE radio communications system 100.Therefore, Fig. 1 illustrates the radio access network (RAN) in LTE radio communications system 100.In this example, have two radio network node 110a and 110b, each radio network node is illustrated as evolved NodeB(eNB).One eNB 110a is configured to serve one or several UE 120a-e of geographic service area 100a or the community 130a being positioned at this eNB.ENB 110a can be connected to core network (CN).ENB 110a also such as can be connected to adjacent eNB 110b via X2 interface, and adjacent eNB 110b is configured to serve another community 130b.Therefore, the 2nd eNB 110b is configured to serve one or several UE 120f-j of geographic service area 100b or the community 130b being positioned at this eNB.ENB 110b also can be connected to CN.
As used hereinafter, should understand, target radio cell can refer in particular to the radio plot be associated with target eNB, and radio plot, source is generally associated with source eNB.Therefore, although each eNB can comprise several radio plots, cell-of-origin and Target cell can provide service by different e NB.In addition, as in the disclosure use, term " UE " to supply any device of user for communicating.Further, term " UE " can refer to mobile terminal, terminal, user terminal (UT), wireless terminal, radio communication device, wireless transmission/reception unit (WTRU), mobile phone, cell phone etc.In addition, term " UE " comprises the MTC(machine type communication not necessarily relating to man-machine interaction) device.Further, term used herein " radio network node " generally represents the fixing point that can communicate with UE.Therefore, it can be called base station, radio base station, NodeB or evolved NodeB(eNB), access point etc.
With reference to figure 2, example embodiment is shown.The method is performed by radio network node.Such as, radio network node can be eNB, such as, eNB 110a shown in Fig. 1 or eNB 110b.Suppose hereinafter, the method is performed by the eNB 110a shown in Fig. 1.ENB 110a serves the first radio plot 130a in hereinafter referred to as radio plot, source.Or change a kind of saying, eNB 110a serves one or several UE being arranged in radio plot, source 130a.Further, suppose hereinafter, eNB 110b serves the second radio plot 130b being called target radio cell.In other words, eNB 110b serves one or several UE being arranged in target radio cell 130b.Therefore, eNB 110a can be called source radio network node or source eNB.Similarly, eNB 110b can be called target radio network node or target eNB.
Radio network node 110a determines 210 business load parameters
p source .Business load parameter
p source it is the parameter of the business load of instruction source radio plot 130a.Therefore, business load parameter
p source about the business load of radio plot, source 130a.Business load parameter
p source it can be one of set of the factor measured of the business load determining radio plot, source 130a.Such as, the set can measuring the factor can comprise: the quantity of the UE in the 130a of radio plot, source, radio resource in the 130a of radio plot, source utilizes (such as, Physical Resource Block (PRB) utilizes), data throughout or data buffering queue size, total transmission power output in the 130a of radio plot, source, etc.Alternatively, this factor can be the so-called subscription ratio described in international patent application WO 2012/125103 A1.In certain embodiments, 210 business load parameters are determined
p source can (that is, in a continuous manner) execution continuously.In an alternative embodiment, can imagine and determine 210 business load parameters in predetermined interval
p source .Such as, predetermined interval can be arranged to every 5,10,15,20,25 or 30 seconds.
Radio network node 110a also receives 220 and comprises about business load parameter
p target the signal of information.Business load parameter
p target it is the parameter of the business load of instruction target radio cell 130b.Therefore, business load parameter
p target about the business load of target radio cell 130b.Such as, eNB 110a can receive from target eNB (that is, being eNB 110b in this example) and comprise about business load parameter
p target this signal of information.Such as, eNB 110a can receive this signal by X2 interface 140 from eNB 110b.Such as, this can according at X2 application protocol X2AP(see 3GPP
tS 36.423 V.11.3.0) in the signaling procedure that is described in further detail and message carry out.Business load parameter
p target it can be one of set of the factor measured of the business load determining target radio cell 130b.Such as, the set can measuring the factor can comprise: the quantity of the UE in the 130b of target radio cell, radio resource in the 130b of target radio cell utilizes (such as, Physical Resource Block (PRB) utilizes), data throughout or data buffering queue size, total transmission power output in the 130b of target radio cell, etc.Alternatively, this factor can be the so-called subscription ratio described in international patent application WO 2012/125103 A1.In certain embodiments, radio network node 110a (that is, in a continuous manner) reception 220 can comprise business load parameter continuously
p target signal.In an alternative embodiment, can imagine, radio network node 110a receives 220 in predetermined interval and comprises business load parameter
p target signal.Such as, predetermined interval can be arranged to every 5,10,15,20,25 or 30 seconds.In addition, radio network node 110a can request after, namely comprise about business load parameter in radio network node 110a transfer request
p target information signal (the radio network node 110b to serving target radio cell) after receive and 220 comprise business load parameter
p target described signal.
Replace as above institute illustrational from eNB 110b receive comprise about
p target the signal of information, can imagine, in an alternative embodiment, eNB 110a can change into receiving from another node (such as, mobile management entity (MME) or gateway (S-GW)) of CN and comprise about business load parameter
p target the signal of information.If like this, so this can according at S1 Application Protocol S1AP(see 3GPP TS 36.413 V.11.2.0) in the signaling procedure that is described in further detail and message carry out.
By the business load parameter of radio plot, source 130a
p source with the business load parameter of target radio cell 130b
p target compare 230.Such as, can by the business load parameter of radio plot, source 130a
p source with the business load parameter of target radio cell 130b
p target compare 230, to determine the business load parameter of radio plot, source
p source whether be less than or equal to the business load parameter of target radio cell
p target .In other words, these two business load parameters can be compared, to determine whether
p source ≤
p target .Because business load parameter is about the business load of corresponding radio community, so when determining
p source ≤
p target time, eNB 110a can infer or determine the business load of the business load in the 130a of cell-of-origin less than or equal to Target cell 130b.
If these two business load parameters are identical (that is,
p source =
p target ), so radio network node can be inferred or determine, radio plot, source is identical with the business load of target radio cell.Similarly, if these two business load parameters are substantially identical (that is,
p source ~
p target ), so radio network node can be inferred or determine, radio plot, source is substantially identical with the business load of target radio cell.When radio plot, source 130a is identical with the business load in the 130b of target radio cell or substantially identical, there is balance in the business load in radio plot, source and target radio cell.Therefore, when
p source with
p target time identical or substantially identical, eNB 110a can infer or determine, radio plot, source 130a and target radio cell 130b is load balance.Sometimes, when determining
p source with
p target time identical or substantially identical, load balance is called that equally loaded balances.
In certain embodiments, when the business load parameter of radio plot, source 130a
p source with the business load parameter of target radio cell 130b
p target between the absolute value of difference when being less than predefine threshold value, eNB 110a can determine that radio plot, source 130a and the business load in the 130b of target radio cell are substantially identical (that is,
p source ~
p target ).That is, when |
p source -
p target | during < threshold value, eNB 110a can determine
p source with
p target substantially identical.The exact value of test and assessment threshold value should be needed based on such as operator in often kind of particular case.Only give some instances, threshold value can be arranged to 0.01,0.02,0.03,0.04 or 0.05.
When determining the business load parameter of 230 radio plots, source
p source with the business load parameter of target radio cell
p target time identical or substantially identical (that is, when radio plot, source 130a and target radio cell 130b is load balance), eNB 110a can comprise alternatively to being provided one or more UE of service to transmit 240 signals by eNB 110a.The measurement that the signal transmitted alternatively is included in UE is about the signal parameter of radio plot, source 130a and the request of measuring about the signal parameter of target radio cell 130b.In an embodiment as illustrated in figure 2, signal parameter is Reference Signal Received Power (RSRP) value.
ENB 110a can receive 250 signals from being provided by eNB 110a each UE one or several UE of service.The signal received comprises: for each UE of therefrom Received signal strength, respectively about the measurement RSRP value of radio plot, source 130a and target radio cell 130b.
ENB 110a determines that 260 one or more UE are for selecting subsequently.Determine to select which (which) UE to be the measurement RSRP value based on each UE source radio plot 130a eNB 110a therefrom being received to 250 signals and the measurement RSRP value about target radio cell 130b.
In one embodiment, measurement RSRP value about radio plot, source 130a and the measurement RSRP value about target radio cell 130b compare for each UE by eNB 110a, and 260 UE that will select are determined on the basis at which (which) UE with the maximum difference between the measurement RSRP value about target radio cell 130b and the measurement RSRP value about radio plot, source 130a.When the basis at which (which) UE with the maximum difference between the measurement RSRP value about target radio cell 130b and the measurement RSRP value about radio plot, source 130a is determined 260 to select UE time, this difference it should be understood that difference
rSRP target -
rSRP source , that is, be not absolute value, but comprise the difference of positive sign or negative sign.In an alternative embodiment, eNB 110a determines 260 UE that will select on the basis which (which) UE has about the maximum measurement RSRP value of target radio cell 130b.Therefore, above two kinds of criterions all can be used for determining that optimal UE is for selecting subsequently, and this will be explained below.Therefore, most suitable UE can be considered as being those UE that experience the best is improved in the utilization of resources when moving to target radio cell 130b from radio plot, source 130a.Such as, due to the better RSRP value about target radio cell, some UE may need the PRB(of smaller amounts compared with PRB number needed in radio plot, source in target radio cell).
Based on determining that 260, eNB 110a selects 270 one or several UE to move to target radio cell 130b from radio plot, source 130a.In one embodiment, eNB 110a selects the particular percentile of the sum of the UE served.Such as, eNB 110 can select to move to target radio cell 130b by 5% of UE sum, 10% or 15% from radio plot, source 130a.The accurate percentage that should move to the UE of target radio cell 130b can change, and preferably such as depends on operator's needs or require for often kind of particular condition test and assess the accurate percentage that or should can move to the UE of target radio cell 130b.In an alternative embodiment, eNB 110 selects the UE of certain maximum quantity to move to target radio cell from radio plot, source.Maximum UE number can be such as 2,5,10 or 20 UE.The accurate maximum quantity that should move to the UE of target radio cell also can change, and preferably such as depends on operator's needs or require the accurate maximum quantity for often kind of particular condition test and assessment UE.
Subsequently, one or several selected UE are moved 280 to target radio cell 130b from radio plot, source 130a.As shown in Figure 3 a, mobile described one or more UE selected by 280 can comprise the signal 310(comprising handover request 311 is shown in Fig. 3 b) transmit 281 to the eNB 110b serving target radio cell 130b.In certain embodiments, the signal 310 comprising handover request 311 can comprise the cause information element 312 of the mobile reason of instruction UE in addition.Reason can be called " UE rotation ", and it should move in question UE by reception eNB 110b instruction due to the reason according to embodiment described herein.Responsively, eNB 110a can from the signal 320 of eNB 110b receiving package containing Handover Request Acknowledge 321.Therefore, Handover Request Acknowledge 321 indicates to eNB 110a, and eNB 110b confirms handover request.After this, selected UE can be moved to from radio plot, the source 130a of source eNB 110a the target radio cell 130b being provided service by eNB 110b.
Forward Figure 1B to now, such exemplary scene is shown, wherein two UE(such as, UE 120c and 120d) move to radio plot 130b from radio plot 130a, and utilize above-mentioned any embodiment, two UE(such as, UE 120f and 120g) move in the opposite direction.These UE can move to new corresponding radio plot from corresponding radio plot, because determine that 260 obtain, these UE move to this another radio plot (that is, target radio cell) by having benefited from most from its radio plot, source.This can improve the utilization of the resource in radio plot 130a and radio plot 130b respectively.
Fig. 4 illustrates another example embodiment.This example embodiment and the embodiment shown in Fig. 2-3 similar.Therefore, similar reference number refers to the similar key element in Fig. 2 and Fig. 3.Further, for ease of understanding the embodiment shown in Fig. 4, hereafter those steps different between these two processes will be only described in detail in.
In method as shown in Figure 4, when determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, start 410 timers or timer function.Like this, only had after the specific predefine past in period, just perform later step 240-280.This predefine can be advantageously arranged to period with mention before for determining the predetermined interval of business load parameter identical (that is, 5,10,15,20,25 or 30 seconds).Therefore, only have when timer or timer function arrive its time predefined restriction, just continuation is performed later step 240-280.Favourable part is like this, only has the business load parameter when determining radio plot, source since last time
p source be less than or equal to the business load parameter of target radio cell
p target specific time predefined past tense afterwards, the UE selected subsequently just moves to target radio cell 130b from radio plot, source 130a.
Fig. 5 illustrates another example embodiment.This example embodiment and the embodiment shown in Fig. 2-3 similar.Therefore, similar reference number refers to the similar key element in Fig. 2 and Fig. 3.For ease of understanding the embodiment shown in Fig. 5, hereafter will only be described in detail in those steps different between these two processes.
In method as shown in Figure 5, eNB 110a receives 550 signals from being provided each UE one or several UE of service by eNB 110a.The signal received comprises: for each UE of therefrom Received signal strength, respectively about the measuring reference signals quality of reception (RSRQ) value of radio plot, source 130a and target radio cell 130b.In other words, the difference of the embodiment in this embodiment and Fig. 2 is, eNB 110a receives the signal comprising RSRQ value instead of RSRP value.Similar with the embodiment in Fig. 2, eNB 110a determines that 560 one or more UE are for selecting subsequently.Determine to select which (which) UE to be the measurement RSRQ value based on each UE source radio plot 130a eNB 110a therefrom being received to 550 signals and the measurement RSRQ value about target radio cell 130b.In an example embodiment, measurement RSRQ value about radio plot, source 130a and the measurement RSRQ value about target radio cell 130b compare for each UE by eNB 110a, and 560 UE that will select are determined on the basis at which (which) UE with the maximum difference between measurement RSRQ value about target radio cell and the measurement RSRQ value about radio plot, source.When the basis at which (which) UE with the maximum difference between the measurement RSRQ value about target radio cell 130b and the measurement RSRQ value about radio plot, source 130a is determined 560 to select UE time, this difference it should be understood that difference
rSRQ target -
rSRQ source , that is, be not absolute value, but comprise the difference of positive sign or negative sign.In an alternative embodiment, eNB 110a determines 560 UE that will select on the basis which (which) UE has about the maximum measurement RSRQ value of target radio cell.Equally, therefore most suitable UE can be considered as being those UE that experience the best is improved in the utilization of resources when moving to target radio cell 130b from radio plot, source 130a.
As can be seen, the method shown in Fig. 5 also can comprise alternatively: when determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, start 410 timers or timer function.This composition graphs 4 is described, and therefore will no longer repeat here.
According to some embodiments disclosed in the disclosure, present inventor proposes, when radio plot, source and target radio cell be load balance (that is,
p source with
p target identical or substantially identical) time, or when this Liang Ge community is when the specific period is load balance, UE is moved (such as, switching) from radio plot, source to target radio cell.Although this may cause temporary negative effect (or at least hindering it to balance) to the balance of the business load between this Liang Ge community, the movement of UE can improve the utilization of resources.Such as, the utilization of resources can be improved needing to/from UE transmission/reception information bit (such as, position/PRB) in how many radio resource.In certain embodiments, only move and will have benefited from most those UE moving to another radio plot from a radio plot.As discussed above, there is various mode to determine which (which) UE is mobile by having benefited from most, such as, utilize measuring-signal parameter (such as, according to RSRP or RSRQ).To understand, the movement of UE can cause temporary laod unbalance being beneficial to more best resource while utilizing.But, in any case the temporary laod unbalance caused all can load balance after a while in trigger network, thus the load compensated between radio plot distribute in the imbalance newly caused.
According to some other embodiments disclosed in the disclosure, present inventor proposes, when radio plot, source business load lower than target radio cell business load (that is,
p source be less than
p target ) time, or when the business load of radio plot, source is less than the business load of target radio cell in the specific period, UE is moved (such as, switching) from radio plot, source to target radio cell.Described in background parts, in this case, load balance will have the effect of UE only movement in one direction, namely, UE generally moves in the direction from the radio plot to another radio plot (that is, having the radio plot of relatively low business load) with relatively high business load.But on the contrary, utilize embodiment of the present disclosure, one or more UE can be in the opposite direction middle mobile, that is, move to the radio plot with relatively high business load from the radio plot with relatively low business load.Although this may hinder the present load situation between this Liang Ge community, this advantageously can improve the utilization of resources.Further, in certain embodiments, only move and will have benefited from most those UE moving to another radio plot from a radio plot.As discussed above, there is various mode to determine which (which) UE is mobile by having benefited from most, such as, utilize measuring-signal parameter (such as, according to RSRP or RSRQ).
Also can imagine, in certain embodiments, according to embodiment described herein, get rid of (or prevention) one or several UE and move to target radio cell from radio plot, source.Such as, the UE generally got rid of from load balance also can get rid of and moves to target radio cell from radio plot, source.The example of the UE got rid of can be the UE with ongoing urgent call.
In a word, some embodiments described herein can allow be beneficial to improve the utilization of resources, capacity and/or performance while prevent the load of the load balance between radio plot from distributing solution.Further, some embodiments can allow such solution, wherein allow to have the radio plot that continues lower business load and the UE required compared with low-resource from the community with higher load and exchange the high UE of its resource requirement.
Forward Fig. 6 to now, will the example embodiment of the radio network node of radio plot, source be described.Radio network node is configured to perform the method according to various embodiment as described above.Radio network node can such as be implemented as the eNB of such as eNB 110a or eNB 110b.In the embodiment shown, radio network node 110 comprises communication interface 61, processor 62, memory 63 and optional timer 64.Communication interface 61 can comprise conveyer Tx and receiver Rx, or alternatively comprises the transceiver Tx/Rx simultaneously with reception and transfer capability.
Receiver 61 is configured to the business load parameter receiving the business load comprised about target radio cell from the radio network node of serving target radio cell
p target signal.Receiver 61 is also configured to from each UE Received signal strength one or more UE 120a-e.For each UE in one or more UE 120a-e, this signal can comprise about the measuring-signal parameter (such as, RSRP value as described above or RSRQ value) of radio plot, source 130a and the measuring-signal parameter about target radio cell 130b.
Memory 63 stores computer program code, makes eNB 110 when this code runs in processor 62: the business load parameter determining the business load about radio plot, source 130a
p source ; By the business load parameter of radio plot, source 130a
p target with the business load parameter of target radio cell 130b
p target compare, to determine the business load parameter of radio plot, source 130a
p source whether be less than or equal to the business load parameter of target radio cell 130b
p target ; Based on the measuring-signal parameter about radio plot, source 130a and the measuring-signal parameter about target radio cell 130b of each UE, determine one or more UE that will select; When determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell, select determined described one or more UE to move to target radio cell 130b from radio plot, source 130a; And selected UE is moved (such as, switching) to target radio cell 130a.
Conveyer 61 can be configured in addition to described one or more UE transmission signal.The measurement that this signal can be included in UE is about the signal parameter of radio plot, source 130a and the request of measuring about the signal parameter of target radio cell 130b.
In certain embodiments, memory 63 and computer program code are configured to make radio network node 110 start timer 64 when determining that the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell by processor 62.Such as, memory 63 and computer program code also can be configured by processor 62 only mobile in response to timer 64 arrives time predefined restriction selected by UE.
Above-mentioned signal parameter can be RSRP value.Therefore, memory 63 and computer program code can be configured to make radio network node 110 by processor 62: for each UE, the measurement RSRP value about radio plot, source and the measurement RSRP value about target radio cell are compared; And the basis at which (which) UE with the maximum difference between measurement RSRP value about target radio cell and the measurement RSRP value about radio plot, source is determined the UE that will select.In addition or alternatively, memory 63 can be configured to make radio network node which (which) UE to have the UE basis about the maximum measurement RSRP value of target radio cell being determined will select at by processor 62.
In addition or alternatively, above-mentioned signal parameter can be RSRQ value.Therefore, memory 63 and computer program code can be configured to make radio network node 110 by processor 62: for each UE, the measurement RSRQ value about radio plot, source and the measurement RSRQ value about target radio cell are compared; And the basis at which (which) UE with the maximum difference between measurement RSRQ value about target radio cell and the measurement RSRQ value about radio plot, source is determined the UE that will select.In addition or alternatively, memory 63 can be configured to make radio network node which (which) UE to have the UE basis about the maximum measurement RSRQ value of target radio cell being determined will select at by processor 62.
In addition, and with reference to figure 3b, conveyer 61 can be configured to the signal 310(comprising handover request 311 to see Fig. 3 b) send the radio network node of serving target radio cell to.This signal 310 can comprise the cause information element 312 of the mobile reason of instruction UE in addition.In addition, receiver 61 can be configured to the signal 311 of radio network node receiving package containing Handover Request Acknowledge from serving target radio cell.
In certain embodiments, memory 63 and computer program code can be configured to make radio network node 110 during predefine period continuously or in predetermined interval by processor 62: the business load parameter determining the radio plot, source of the business load about radio plot, source; Determine the business load parameter of the target radio cell of the business load about target radio cell; And the business load parameter of radio plot, source and the business load parameter of target radio cell are compared, to determine whether the business load parameter of radio plot, source is less than or equal to the business load parameter of target radio cell.
In addition, memory 63 and computer program code are configured to make radio network node 110 by processor 62: when the business load parameter of radio plot, source equals the business load parameter of target radio cell, determine that radio plot, source and target radio cell are load balances.
Should understand, when adjacent radio cells covers different geographic regions, principle described herein, aspect and embodiment are applicable.Will be further appreciated that principle described herein, aspect and embodiment are also applicable when adjacent radio cells is overlapping or partly overlap.Further, should understand, when adjacent radio cells on the same frequency time or when adjacent radio cells on a different frequency time, principle described herein, aspect and embodiment are also applicable.In addition, when schematically shown in Figure 7, when single radio network node (such as, eNB 110a) serves two adjacent radio cells 130a and 130b, principle described herein, aspect and embodiment are also applicable.If like this, so eNB 110a had both served radio plot, source 130a, served again target radio cell 130b.In this embodiment, thus eNB 110a both can serve as source eNB in X2 signaling procedure, can serve as target eNB again.Alternatively, without the need to using X2 interface, but eNB 110 can change into and performs method described herein when not relating to X2 interface.Therefore, not the business load parameter that receiving package contains target radio cell
p target signal, oneself is determined the business load parameter of target radio cell by eNB 110a
p target .
In the description described in detail above, in order to the object explained instead of limit, set forth detail, fully to understand the various embodiments described in the disclosure.In some cases, eliminate the detailed description to well known device, assembly, circuit and method, in order to avoid obscure the description to embodiment disclosed herein by unnecessary details.All statements and the particular example thereof of wishing to record principle disclosed herein, aspect and embodiment herein contain its 26S Proteasome Structure and Function equivalent.In addition, wish that these equivalents comprise the equivalent of current known equivalent and following exploitation, that is, any key element of the execution identical function developed and not tubular construction.Therefore, such as, will understand, block diagram herein can represent the illustrative circuit of principle or the conceptual view of other functional unit of implementing these embodiments.Similarly, will understand, the representative such as any flow chart can substantially represent and therefore be performed by computer or processor and whether no matter the various processes of this computer or processor are clearly shown in computer-readable medium.The function comprising the various key elements of functional block can provide by using hardware, and hardware can be circuit hardware and/or the hardware of the software of the form that such as can perform storage coded command on a computer-readable medium.Therefore, these functions and shown functional block will be interpreted as it is hardware implementing and/or computer implemented, and therefore be that machine realizes.In hardware implementing, functional block can comprise or contain but to be non-ly confined to: digital signal processor (DSP) hardware; Compacting instruction set processor; Hardware (such as, numeral or simulation) circuit, includes but not limited to application-specific integrated circuit (ASIC) [ASIC] and/or field programmable gate array (FPGA); And (properly) can perform the state machine of these functions.In computer realizes, computer is generally understood as and comprises one or more processor or one or more controller.When being provided by computer or processor or controller, these functions can provide by single special-purpose computer or processor or controller or by single Sharing computer or processor or controller or by multiple independent computer or processor or controller (some of them can be shared or distributed).In addition, term " processor " or " controller " is used also to be interpreted as referring to other hardware that can perform these functions and/or executive software, exemplary hardware such as mentioned above.
Although describe various embodiment of the present disclosure with reference to specific embodiment above, do not wish that it is confined to set forth particular form herein.Such as, although describe various embodiment with reference to 3GPP LTE radio communications system, embodiment disclosed herein can may be applied equally in other radio communications system of such as 3GPP UMTS radio communications system.If like this, so radio network node can be implemented as such as radio network controller (RNC).Embodiment of the present disclosure is only limited by claim of enclosing, and other embodiment beyond above specific embodiment equally may in the scope of enclosing claim.As used herein, term " comprises " or does not get rid of " comprising " existence of other key element or step.In addition, although each feature may comprise in different claims, their may be able to advantageously combine, and to comprise different claim be not that to infer the combination of feature infeasible and/or not favourable.In addition, singular reference does not get rid of plural number.Finally, provide the reference symbol in claim just as illustrating example, and should not be construed as the scope limiting claim by any way.
Claims (29)
1., by the method that the radio network node (110) of serving radio plot, source performs, described method comprises:
Determine (210) business load parameter about the business load of radio plot, described source;
The signal of the business load parameter of the business load about described target radio cell is comprised from radio network node reception (220) of serving target radio cell;
The described business load parameter of radio plot, described source and the described business load parameter of described target radio cell are compared (230), to determine whether the described business load parameter of radio plot, described source is less than or equal to the described business load parameter of described target radio cell;
(250 are received from each UE one or more subscriber equipment (UE); 550) signal, described signal comprises the measuring-signal parameter about radio plot, described source and the measuring-signal parameter about described target radio cell;
Based on the described measuring-signal parameter about radio plot, described source and the described measuring-signal parameter about described target radio cell of each UE in described UE, determine (260; 560) one or more UE that will select;
When the described business load parameter of radio plot, described source is less than or equal to the business load parameter of described target radio cell, select (270) that the described one or more UE determined are moved to described target radio cell from radio plot, described source; And
The UE of described selection is moved (280) to described target radio cell.
2. the method for claim 1, is also included in and receives (250 from each UE described one or more UE; 550) before described signal:
(240 are transmitted to described one or more UE; 540) signal, the measurement that described signal is included in described UE is about the signal parameter of radio plot, described source and the request of measuring about the signal parameter of described target radio cell.
3. method as claimed in claim 1 or 2, comprising:
(410) timer is started when determining that the described business load parameter of radio plot, described source is less than or equal to the business load parameter of described target radio cell, and
The UE of (280) described selection is only moved in response to described timer arrives time predefined restriction.
4. the method as described in claim arbitrary in claim 1-3, wherein said signal parameter is Reference Signal Received Power RSRP value.
5. method as claimed in claim 4, comprising:
For each UE in described UE, the measurement RSRP value about radio plot, described source and the measurement RSRP value about described target radio cell are compared (260), and
Which (which) UE have about described target radio cell described measurement RSRP value and measure about radio plot, described source described on the basis of the maximum difference between RSRP value, determine the UE that (260) will be selected.
6. method as claimed in claim 4, comprising:
At which (which) UE have on the basis about the maximum measurement RSRP value of described target radio cell, determine the UE that (260) will be selected.
7. the method as described in claim arbitrary in claim 1-3, wherein said signal parameter is Reference Signal Received Quality RSRQ value.
8. method as claimed in claim 7, comprising:
For each UE in described UE, the described measurement RSRQ value about radio plot, described source is compared (560) with the described RSRQ value of measuring about described target radio cell, and
At which (which) UE, there is the described measurement RSRQ value about described target radio cell of each UE in described UE and measure about radio plot, described source described on the basis of the maximum difference between RSRQ value, determining the UE that (560) will be selected.
9. method as claimed in claim 7, comprising:
At which (which) UE have on the basis about the maximum measurement RSRQ value of described target radio cell, determine the UE that (560) will be selected.
10. the method as described in claim arbitrary in aforementioned claim, wherein moves (280) and comprises to described target radio cell and will comprise the signal transmission (281) of handover request to the described radio network node of serving described target radio cell by the UE of described selection.
11. methods as claimed in claim 10, the described signal wherein comprising described handover request comprises the cause information element of the reason of the described movement of instruction UE in addition.
12. methods as described in claim arbitrary in claim 10-11, comprise and receive from the described radio network node of serving described target radio cell the signal that (282) comprise Handover Request Acknowledge.
13. methods as described in claim arbitrary in aforementioned claim, wherein perform following steps: determine (210) described business load parameter about the radio plot, described source of the described business load of radio plot, described source continuously or in predetermined interval; Receive the signal that (220) comprise the described business load parameter of the described target radio cell of the described business load about described target radio cell; And the described business load parameter of radio plot, described source and the described business load parameter of described target radio cell are compared (230), to determine whether the described business load parameter of radio plot, described source is less than or equal to the described business load parameter of described target radio cell.
14. methods as described in claim arbitrary in aforementioned claim, comprising:
When the described business load parameter of radio plot, described source equals the described business load parameter of described target radio cell, determine that (230) radio plot, described source and described target radio cell are load balances.
15. 1 kinds for serving the radio network node (110) of radio plot, source, wherein said radio network node comprises:
Receiver (61), is configured to the signal receiving the business load parameter of the business load comprised about described target radio cell from the radio network node of serving target radio cell; And wherein said receiver (61) is also configured to from each UE Received signal strength one or more UE, and described signal comprises the measuring-signal parameter about radio plot, described source and the measuring-signal parameter about described target radio cell;
Processor (62); And
Store the memory (63) of computer program code, when described computer program code runs in described processor, make described radio network node (110):
Determine the business load parameter of the business load about radio plot, source;
The described business load parameter of radio plot, described source and the described business load parameter of described target radio cell are compared, to determine whether the described business load parameter of radio plot, described source is less than or equal to the described business load parameter of described target radio cell;
Based on the described measuring-signal parameter about radio plot, described source and the described measuring-signal parameter about described target radio cell of each UE in described UE, determine one or more UE that will select;
When the described business load parameter of radio plot, described source is less than or equal to the business load parameter of described target radio cell, select the described one or more UE determined to move to described target radio cell from radio plot, described source; And
The UE of described selection is moved to described target radio cell.
16. radio network node (110) as claimed in claim 15, also comprise:
Conveyer (61), is configured to described one or more UE transmission signal, and the measurement that described signal is included in described UE is about the signal parameter of radio plot, described source and the request of measuring about the signal parameter of described target radio cell.
17. radio network node (110) as described in claim 15 or 16, also comprise timer (64), and wherein said memory (63) and described computer program code are configured to make described radio network node (110) start described timer (64) when determining that the described business load parameter of radio plot, described source is less than or equal to the business load parameter of described target radio cell by described processor (62), and only arrive the UE of time predefined restriction and mobile described selection in response to described timer (64).
18. radio network node (110) as described in claim arbitrary in claim 15-17, wherein said signal parameter is Reference Signal Received Power RSRP value.
19. radio network node (110) as claimed in claim 18, wherein said memory (63) and described computer program code are configured to make described radio network node (110) by described processor (62):
For each UE in described UE, the measurement RSRP value about radio plot, described source and the measurement RSRP value about described target radio cell are compared, and
Which (which) UE have about described target radio cell described measurement RSRP value and measure about radio plot, described source described on the basis of the maximum difference between RSRP value, determine the UE that will select.
20. radio network node (110) as claimed in claim 18, wherein said memory (63) and described computer program code are configured to make described radio network node (110) by described processor (62):
At which (which) UE have on the basis about the maximum measurement RSRP value of described target radio cell, determine the UE that will select.
21. radio network node (110) as described in claim arbitrary in claim 15-17, wherein said signal parameter is Reference Signal Received Quality RSRQ value.
22. radio network node (110) as claimed in claim 21, wherein said memory (63) and described computer program code are configured to make described radio network node (110) by described processor (62):
For each UE in described UE, the described measurement RSRQ value about radio plot, described source is compared with the described RSRQ value of measuring about described target radio cell, and
At which (which) UE, there is the described measurement RSRQ value about described target radio cell of each UE in described UE and measure about radio plot, described source described on the basis of the maximum difference between RSRQ value, determining the UE that will select.
23. radio network node (110) as claimed in claim 21, wherein said memory (63) and described computer program code are configured to make described radio network node (110) by described processor (62):
At which (which) UE have on the basis about the maximum measurement RSRQ value of described target radio cell, determine the UE that will select.
24. radio network node (110) as described in claim arbitrary in claim 15-23, wherein said conveyer (61) is configured to the signal comprising handover request be sent to the described radio network node of serving described target radio cell.
25. radio network node (110) as claimed in claim 24, wherein said conveyer (61) is configured to transmit the described signal comprising described handover request, and wherein this signal comprises the cause information element of the reason of the described movement of instruction UE in addition.
26. radio network node (110) as described in claim arbitrary in claim 24-25, wherein said receiver (61) is configured to the signal of described radio network node receiving package containing Handover Request Acknowledge from serving described target radio cell.
27. radio network node (110) as described in claim arbitrary in claim 15-26, wherein said receiver (61) is configured to continuously or receives the described signal of described business load parameter of described target radio cell of the described business load comprised about described target radio cell in predetermined interval; And wherein said memory (63) and described computer program code are configured to make described radio network node (110) continuously or in predetermined interval by described processor (62): the described business load parameter determining the radio plot, described source of the described business load about radio plot, described source; And the described business load parameter of radio plot, described source and the described business load parameter of described target radio cell are compared, to determine whether the described business load parameter of radio plot, described source is less than or equal to the described business load parameter of described target radio cell.
28. radio network node (110) as described in claim arbitrary in claim 15-27, wherein said memory (63) and described computer program code are configured to make described radio network node (110) by described processor (62):
When the described business load parameter of radio plot, described source equals the described business load parameter of described target radio cell, determine that radio plot, described source and described target radio cell are load balances.
29. radio network node (110) as described in claim arbitrary in claim 15-28, wherein said radio network node is evolved NodeB.
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| CN112887043A (en) * | 2016-09-22 | 2021-06-01 | Oppo广东移动通信有限公司 | Method and apparatus for handover |
| CN112887044A (en) * | 2016-09-22 | 2021-06-01 | Oppo广东移动通信有限公司 | Method and apparatus for handover |
| US11218936B2 (en) | 2016-09-22 | 2022-01-04 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for handover |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2944119A1 (en) | 2015-11-18 |
| EP2944119B1 (en) | 2017-05-17 |
| US9936432B2 (en) | 2018-04-03 |
| CN104904268B (en) | 2019-06-28 |
| EP2944119A4 (en) | 2016-09-21 |
| US20150358883A1 (en) | 2015-12-10 |
| WO2014109681A1 (en) | 2014-07-17 |
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